Cheap & Dirty Screen Printing Tutorial

Materials needed: A t-shirt, paint brushes, straw - if desired, an embroidery hoop, (bull clip +) card board, screen printing ink (I use Speedball brand), a glue that isn't water-soluble (I use Mod Podge), a sheer netted material/old nylons, and a computer with a printer (or a good hand for drawing things).

Find an image you like and that has good contrast. Print it out so the image is the size you want it on the t-shirt

After pulling the sheer material/old nylons tight across the embroidery hoop (and screwing it shut really good), trace the image onto the material with a pencil with the material close to the paper, not upside down so it's far away. Turn the thing over and with the glue, paint all the "negative space," (all the places you don't want ink to go, the white space). Make sure the material isn't touching whatever surface you're working on otherwise you'll end up gluing the whole thing down.
After the glue dries (I recommend a test print 1st to see if you need to touch up any areas with more glue), center the image on the shirt face down, and I sort of stipple the ink through the material, I used a straw to move drop the ink and then a bull clip + card board to make sure it was fully saturated, but also making sure not to glob it all over the place.
Carefully peel it back, wait for it to dry, and follow the "setting" directions on the ink (mine is to iron it on medium 3 - 5 minutes each side with a piece of cloth/paper between the iron and the ink). Be sure to wash your screen right away, this way you can use it again and again!

And Ta Da!
Photo and example assistance by Christina Beard!